|Publication number||US6598162 B1|
|Application number||US 09/046,627|
|Publication date||Jul 22, 2003|
|Filing date||Mar 24, 1998|
|Priority date||Jan 17, 1996|
|Also published as||US5745569, WO1997026732A1|
|Publication number||046627, 09046627, US 6598162 B1, US 6598162B1, US-B1-6598162, US6598162 B1, US6598162B1|
|Inventors||Scott A. Moskowitz|
|Original Assignee||Scott A. Moskowitz|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (52), Non-Patent Citations (12), Referenced by (148), Classifications (11), Legal Events (6)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation-in-part of U.S. patent application Ser. No. 08/587,943, filed Jan. 17, 1996, (which issued Apr. 28, 1998, as U.S. Pat. No. 5,745,569) entitled “Method for Stega-Cipher Protection of Computer Code”, the entire disclosure of which is hereby incorporated by reference.
The invention relates to the protection of digital information. More particularly, the invention relates to a method for combining transfer functions with predetermined key creation.
Increasingly, commercially valuable information is being created and stored in “digital” form. For example, music, photographs and video can all be stored and transmitted as a series of numbers, such as 1's and 0's. Digital techniques let the original information be recreated in a very accurate manner. Unfortunately, digital techniques also let the information be easily copied without the information owner's permission.
Because unauthorized copying is clearly a disincentive to the digital distribution of valuable information, it is important to establish responsibility for copies and derivative copies of such works. For example, if each authorized digital copy of a popular song is identified with a unique number, any unauthorized copy of the song would also contain the number. This would allow the owner of the information, such as a song publisher, to investigate who made the unauthorized copy. Unfortunately, it is possible that the unique number could be erased or altered if it is simply tacked on at the beginning or end of the digital information.
As will be described, known digital “watermark” techniques give creators and publishers of digitized multimedia content localized, secured identification and authentication of that content. In considering the various forms of multimedia content, such as “master,” stereo, National Television Standards Committee (NTSC) video, audio tape or compact disc, tolerance of quality will vary with individuals and affect the underlying commercial and aesthetic value of the content. For example, if a digital version of a popular song sounds distorted, it will be less valuable to users. It is therefore desirable to embed copyright, ownership or purchaser information, or some combination of these and related data, into the content in a way that will damage the content if the watermark is removed without authorization.
To achieve these goals, digital watermark systems insert ownership information in a way that causes little or no noticeable effects, or “artifacts,” in the underlying content signal. For example, if a digital watermark is inserted into a digital version of a song, it is important that a listener not be bothered by the slight changes introduced by the watermark. It is also important for the watermark technique to maximize the encoding level and “location sensitivity” in the signal to force damage to the content signal when removal is attempted. Digital watermarks address many of these concerns, and research in the field has provided extremely robust and secure implementations.
What has been overlooked in many applications described in the art, however, are systems which closely mimic distribution of content as it occurs in the real world. For instance, many watermarking systems require the original un-watermarked content signal to enable detection or decode operations. These include highly publicized efforts by NEC, Digimarc and others. Such techniques are problematic because, in the real world, original master copies reside in a rights holders vaults and are not readily available to the public.
With much activity overly focused on watermark survivability, the security of a digital watermark is suspect. Any simple linear operation for encoding information into a signal may be used to erase the embedded signal by inverting the process. This is not a difficult task, especially when detection software is a plug-in freely available to the public, such as with Digimarc. In general, these systems seek to embed cryptographic information, not cryptographically embed information into target media content.
Other methods embed ownership information that is plainly visible in the media signal, such as the method described in U.S. Pat. No. 5,530,739 to Braudaway et al. The system described in Braudaway protects a digitized image by encoding a visible watermark to deter piracy. Such an implementation creates an immediate weakness in securing the embedded information because the watermark is plainly visible. Thus, no search for the embedded signal is necessary and the watermark can be more easily removed or altered. For example, while certainly useful to some rights owners, simply placing the symbol “Ĉ” in the digital information would only provide limited protection. Removal by adjusting the brightness of the pixels forming the “Ĉ” would not be difficult with respect to the computational resources required.
Other relevant prior art includes U.S. Pat. Nos. 4,979,210 and 5,073,925 to Nagata et al., which encodes information by modulating an audio signal in the amplitude/time domain. The modulations introduced in the Nagata process carry a “copy/don't copy” message, which is easily found and circumvented by one skilled in the art. The granularity of encoding is fixed by the amplitude and frequency modulation limits required to maintain inaudibility. These limits are relatively low, making it impractical to encode more information using the Nagata process.
Although U.S. Pat. No. 5,664,018 to Leighton describes a means to prevent collusion attacks in digital watermarks, the disclosed method may not actually provide the security described. For example, in cases where the watermarking technique is linear, the “insertion envelope” or “watermarking space” is well-defined and thus susceptible to attacks less sophisticated than collusion by unauthorized parties. Over-encoding at the watermarking encoding level is but one simple attack in such linear implementations. Another consideration not made by Leighton is that commercially-valuable content may already exist in a unwatermarked form somewhere, easily accessible to potential pirates, gutting the need for any type of collusive activity. Digitally signing the embedded signal with preprocessing of watermark data is more likely to prevent successful collusion. Furthermore, a “baseline” watermark as disclosed is quite subjective. It is simply described elsewhere in the art as the “perceptually significant” regions of a signal. Making a watermarking function less linear or inverting the insertion of watermarks would seem to provide the same benefit without the additional work required to create a “baseline” watermark. Indeed, watermarking algorithms should already be capable of defining a target insertion envelope or region without additional steps. What is evident is the Leighton patent does not allow for initial prevention of attacks on an embedded watermark as the content is visibly or audibly unchanged.
It is also important that any method for providing security also function with broadcasting media over networks such as the Internet, which is also referred to as “streaming.” Commercial “plug-in” products such as RealAudio and RealVideo, as well as applications by vendors VDONet and Xtreme, are common in such network environments. Most digital watermark implementations focus on common file base signals and fail to anticipate the security of streamed signals. It is desirable that any protection scheme be able to function with a plug-in player without advanced knowledge of the encoded media stream.
Other technologies focus solely on file-based security. These technologies illustrate the varying applications for security that must be evaluated for different media and distribution environments. Use of cryptolopes or cryptographic containers, as proposed by IBM in its Cryptolope product, and InterTrust, as described in U.S. Pat. Nos. 4,827,508, 4,977,594, 5,050,213 and 5,410,598, may discourage certain forms of piracy. Cryptographic containers, however, require a user to subscribe to particular decryption software to decrypt data. IBM's InfoMarket and InterTrust's DigiBox, among other implementations, provide a generalized model and need proprietary architecture to function. Every user must have a subscription or registration with the party which encrypts the data. Again, as a form of general encryption, the data is scrambled or encrypted without regard to the media and its formatting. Finally, control over copyrights or other neighboring rights is left with the implementing party, in this case, IBM, InterTrust or a similar provider.
Methods similar to these “trusted systems” exist, and Cerberus Central Limited and Liquid Audio, among a number of companies, offer systems which may functionally be thought of as subsets of IBM and InterTrust's more generalized security offerings. Both Cerberus and Liquid Audio propose proprietary player software which is registered to the user and “locked” in a manner parallel to the locking of content that is distributed via a cryptographic container. The economic trade-off in this model is that users are required to use each respective companies' proprietary player to play or otherwise manipulate content that is downloaded. If, as is the case presently, most music or other media is not available via these proprietary players and more companies propose non-compatible player formats, the proliferation of players will continue. Cerberus and Liquid Audio also by way of extension of their architectures provide for “near-CD quality” but proprietary compression. This requirement stems from the necessity not to allow content that has near-identical data make-up to an existing consumer electronic standard, in Cerberus and Liquid Audio's case the so-called Red Book audio CD standard of 16 bit 44.1 kHz, so that comparisons with the proprietary file may not yield how the player is secured. Knowledge of the player's file format renders its security ineffective as a file may be replicated and played on any common player, not the intended proprietary player of the provider of previously secured and uniquely formatted content. This is the parallel weakness to public key crypto-systems which have gutted security if enough plain text and cipher text comparisons enable a pirate to determine the user's private key.
Many approaches to digital watermarking leave detection and decoding control with the implementing party of the digital watermark, not the creator of the work to be protected. A set of secure digital watermark implementations address this fundamental control issue forming the basis of key-based approaches. These are covered by the following patents and pending applications, the entire disclosures of which are hereby incorporated by reference: U.S. Pat. No. 5,613,004 entitled “Steganographic Method and Device” and its derivative U.S. patent application Ser. Nos. 08/775,216, 08/587,944 entitled “Human Assisted Random Key Generation and Application for Digital Watermark System,” U.S. patent application Ser. No. 08/587,943 entitled “Method for Stega-Cipher Protection of Computer Code,” U.S. patent application Ser. No. 08/677,435 entitled “Optimization Methods for the Insertion, Protection, and Detection of Digital Watermarks in Digitized Data,” and U.S. patent application Ser. No. 08/772,222 entitled “Z-Transform Implementation of Digital Watermarks.” Public key crypto-systems are described in U.S. Pat. Nos. 4,200,770, 4,218,582, 4,405,829 and 4,424,414, the entire disclosures of which are also hereby incorporated by reference.
In particular, an improved protection scheme is described in “Method for Stega-Cipher Protection of Computer Code,” U.S. patent application Ser. No. 08/587,943. This technique uses the key-based insertion of binary executable computer code within a content signal that is subsequently, and necessarily, used to play or otherwise manipulate the signal in which it is encoded. With this system, however, certain computational requirements, such as one digital player per digital copy of content, may be necessitated. For instance, a consumer may download many copies of watermarked content. With this technique, the user would also be downloading as many copies of the digital player program. While this form of security may be desirable for some applications, it is not appropriate in many circumstances.
Finally, even when digital information is distributed in encoded form, it may be desirable to allow unauthorized users to play the information with a digital player, perhaps with a reduced level of quality. For example, a popular song may be encoded and freely distributed in encoded form to the public. The public, perhaps using commonly available plug-in digital players, could play the encoded content and hear the music in some degraded form. The music may sound choppy, or fuzzy or be degraded in some other way. This lets the public decide, based on the available lower quality version of the song, if they want to purchase a key from the publisher to decode, or “clean-up,” the content. Similar approaches could be used to distribute blurry pictures or low quality video. Or even “degraded” text, in the sense that only authenticated portions of the text can be determined with the predetermined key or a validated digital signature for the intended message.
In view of the foregoing, it can be appreciated that a substantial need exists for a method allowing encoded content to be played, with degraded quality, by a plug-in digital player, and solving the other problems discussed above.
The disadvantages of the art are alleviated to a great extent by a method for combining transfer functions with predetermined key creation. In one embodiment, digital information, including a digital sample and format information, is protected by identifying and encoding a portion of the format information. Encoded digital information, including the digital sample and the encoded format information, is generated to protect the original digital information.
In another embodiment, a digital signal, including digital samples in a file format having an inherent granularity, is protected by creating a predetermined key. The predetermined key is comprised of a transfer function-based mask set to manipulate data at the inherent granularity of the file format of the underlying digitized samples.
With these and other advantages and features of the invention that will become hereinafter apparent, the nature of the invention may be more clearly understood by reference to the following detailed description of the invention, the appended claims and to the several drawings attached herein.
FIG. 1 is a block flow diagram of a method for copy protection or authentication of digital information according to an embodiment of the present invention.
In accordance with an embodiment of the present invention, a method combines transfer functions with predetermined key creation. Increased security is achieved in the method by combining elements of “public-key steganography” with cryptographic protocols, which keep in-transit data secure by scrambling the data with “keys” in a manner that is not apparent to those with access to the content to be distributed. Because different forms of randomness are combined to offer robust, distributed security, the present invention addresses an architectural “gray space” between two important areas of security: digital watermarks, a subset of the more general art of steganography, and cryptography. One form of randomness exists in the mask sets that are randomly created to map watermark data into an otherwise unrelated digital signal. The second form of randomness is the random permutations of data formats used with digital players to manipulate the content with the predetermined keys. These forms can be thought of as the transfer function versus the mapping function inherent to digital watermarking processes.
According to an embodiment of the present invention, a predetermined, or randomly generated, key is used to scramble digital information in a way that is unlike known “digital watermark” techniques and public key crypto-systems. As used herein, a key is also referred to as a “mask set” which includes one or more random or pseudo-random series of bits. Prior to encoding, a mask can be generated by any cryptographically secure random generation process. A block cipher, such as a Data Encryption Standard (DES) algorithm, in combination with a sufficiently random seed value, such as one created using a Message Digest 5 (MD5) algorithm, emulates a cryptographically secure random bit generator. The keys are saved in a database, along with information matching them to the digital signal, for use in descrambling and subsequent viewing or playback. Additional file format or transfer property information is prepared and made available to the encoder, in a bit addressable manner. As well, any authenticating function can be combined, such as Digital Signature Standard (DSS) or Secure Hash Algorithm (SHA).
Using the predetermined key comprised of a transfer function-based mask set, the data representing the original content is manipulated at the inherent granularity of the file format of the underlying digitized samples. Instead of providing, or otherwise distributing, watermarked content that is not noticeably altered, a partially “scrambled” copy of the content is distributed. The key is necessary both to register the sought-after content and to descramble the content into its original form.
The present invention uses methods disclosed in “Method for Stega-Cipher Protection of Computer Code,” U.S. patent application Ser. No. 08/587,943, with respect to transfer functions related to the common file formats, such as PICT, TIFF, AIFF, WAV, etc. Additionally, in cases where the content has not been altered beyond being encoded with such functional data, it is possible for a digital player to still play the content because the file format has not been altered. Thus, the encoded content could still be played by a plug-in digital player as discrete, digitally sampled signals, watermarked or not. That is, the structure of the file can remain basically unchanged by the watermarking process, letting common file format based players work with the “scrambled” content.
For example, the Compact Disc-Digital Audio (CD-DA) format stores audio information as a series of frames. Each frame contains a number of digital samples representing, for example, music, and a header that contains file format information. As shown in FIG. 1, according to an embodiment of the present invention some of the header information can be identified and “scrambled” using the predetermined key at steps 110 to 130. The music samples can remain unchanged. Using this technique, a traditional CD-DA player will be able to play a distorted version of the music in the sample. The amount of distortion will depend on the way, and extent, that the header, or file format, information has been scrambled. It would also be possible to instead scramble some of the digital samples while leaving the header information alone. In general, the digital signal would be protected by manipulating data at the inherent granularity, or “frames,” of the CD-DA file format. To decode the information, a predetermined key is used before playing the digital information at steps 140 and 150.
A key-based decoder can act as a “plug-in” digital player of broadcast signal streams without foreknowledge of the encoded media stream. Moreover, the data format orientation is used to partially scramble data in transit to prevent unauthorized descrambled access by decoders that lack authorized keys. A distributed key can be used to unscramble the scrambled content because a decoder would understand how to process the key. Similar to on-the-fly decryption operations, the benefits inherent in this embodiment include the fact that the combination of watermarked content security, which is key-based, and the descrambling of the data, can be performed by the same key which can be a plurality of mask sets. The mask sets may include primary, convolution and message delimiter masks with file format data included.
The creation of an optimized “envelope” for insertion of watermarks provides the basis of much watermark security, but is also a complementary goal of the present invention. The predetermined or random key that is generated is not only an essential map to access the hidden information signal, but is also the descrambler of the previously scrambled signal's format for playback or viewing.
In a system requiring keys for watermarking content and validating the distribution of the content, different keys may be used to encode different information while secure one way hash functions or one-time pads may be incorporated to secure the embedded signal. The same keys can be used to later validate the embedded digital signature, or even fully decode the digital watermark if desired. Publishers can easily stipulate that content not only be digitally watermarked but that distributors must check the validity of the watermarks by performing digital signature checks with keys that lack any other functionality. The system can extend to simple authentication of text in other embodiments.
Before such a market is economically feasible, there are other methods for deploying key-based watermarking coupled with transfer functions to partially scramble the content to be distributed without performing full public key encryption, i.e., a key pair is not necessarily generated, simply, a predetermined key's function is created to re-map the data of the content file in a lossless process. Moreover, the scrambling performed by the present invention may be more dependent on the file in question. Dissimilarly, encryption is not specific to any particular media but is performed on data. The file format remains unchanged, rendering the file useable by any conventional viewer/player, but the signal quality can be intentionally degraded in the absence of the proper player and key. Public-key encryption seeks to completely obscure the sensitive “plaintext” to prevent comparisons with the “ciphertext” to determine a user's private keys. Centralized encryption only differs in the utilization of a single key for both encryption and decryption making the key even more highly vulnerable to attacks to defeat the encryption process. With the present invention, a highly sought after photograph may be hazy to the viewer using any number of commonly available, nonproprietary software or hardware, without the authorized key. Similarly, a commercially valuable song may sound poor.
The benefit of some form of cryptography is not lost in the present invention. In fact, some piracy can be deterred when the target signal may be known but is clearly being protected through scrambling. What is not anticipated by known techniques, is an a'la carte method to change various aspects of file formatting to enable various “scrambled states” for content to be subsequently distributed. An image may lack all red pixels or may not have any of the most significant bits activated. An audio sample can similarly be scrambled to render it less-than-commercially viable.
The present invention also provides improvements over known network-based methods, such as those used for the streaming of media data over the Internet. By manipulating file formats, the broadcast media, which has been altered to “fit” within electronic distribution parameters, such as bandwidth availability and error correction considerations, can be more effectively utilized to restrict the subsequent use of the content while in transit as well as real-time viewing or playing.
The mask set providing the transfer function can be read on a per-use basis by issuing an authorized or authenticating “key” for descrambling the signal that is apparent to a viewer or a player or possessor of the authenticating key. The mask set can be read on a per-computer basis by issuing the authorized key that is more generalized for the computer that receives the broadcast signals. Metering and subscription models become viable advantages over known digital watermark systems which assist in designating the ownership of a copy of digitized media content, but do not prevent or restrict the copying or manipulation of the sampled signal in question. For broadcast or streamed media, this is especially the case. Message authentication is also possible, though not guaranteeing the same security as an encrypted file as with general crypto systems.
The present invention thus benefits from the proprietary player model without relying on proprietary players. No new players will be necessary and existing multimedia file formats can be altered to exact a measure of security which is further increased when coupled with digital watermarks. As with most consumer markets for media content, predominant file formats exist, de facto, and corresponding formats for computers likewise exist. For a commercial compact disc quality audio recording, or 16 bit 44.1 kHz, corresponding file formats include: Audio Interchange File Format (AIFF), Microsoft WAV, Sound Designer II, Sun's .au, Apple's Quicktime, etc. For still image media, formats are similarly abundant: TIFF, PICT, JPEG, GIF, etc. Requiring the use of additional proprietary players, and their complementary file formats, for limited benefits in security is wasteful. Moreover, almost all computers today are multimedia-capable, and this is increasingly so with the popularity of Intel's MMX chip architecture and the PowerPC line of microchips. Because file formatting is fundamental in the playback of the underlying data, the predetermined key can act both as a map, for information to be encoded as watermark data regarding ownership, and a descrambler of the file that has been distributed. Limitations will only exist in how large the key must be retrofitted for a given application, but any manipulation of file format information is not likely to exceed the size of data required versus that for an entire proprietary player.
As with previous disclosures by the inventor on digital watermarking techniques, the present invention may be implemented with a variety of cryptographic protocols to increase both confidence and security in the underlying system. A predetermined key is described as a set of masks. These masks may include primary, convolution and message delimiter mask. In previous disclosures, the functionality of these masks is defined solely for mapping. The present invention includes a mask set which is also controlled by the distributing party of a copy of a given media signal. This mask set is a transfer function which is limited only by the parameters of the file format in question. To increase the uniqueness or security of each key used to scramble a given media file copy, a secure one way hash function can be used subsequent to transfer properties that are initiated to prevent the forging of a particular key. Public and private keys may be used as key pairs to further increase the unlikeliness that a key may be compromised.
These same cryptographic protocols can be combined with the embodiments of the present invention in administering streamed content that requires authorized keys to correctly display or play the streamed content in an unscrambled manner. As with digital watermarking, symmetric or asymmetric public key pairs may be used in a variety of implementations. Additionally, the need for certification authorities to maintain authentic key-pairs becomes a consideration for greater security beyond symmetric key implementations. The cryptographic protocols makes possible, as well, a message of text to be authenticated by a message authenticating function in a general computing device that is able to ensure secure message exchanges between authorizing parties.
Although various embodiments are specifically illustrated and described herein, it will be appreciated that modifications and variations of the present invention are covered by the above teachings and within the purview of the appended claims without departing from the spirit and intended scope of the invention.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US4200770||Sep 6, 1977||Apr 29, 1980||Stanford University||Cryptographic apparatus and method|
|US4218582||Oct 6, 1977||Aug 19, 1980||The Board Of Trustees Of The Leland Stanford Junior University||Public key cryptographic apparatus and method|
|US4339134 *||Jul 5, 1977||Jul 13, 1982||Rockwell International Corporation||Electronic card game|
|US4405829||Dec 14, 1977||Sep 20, 1983||Massachusetts Institute Of Technology||Cryptographic communications system and method|
|US4424414||May 1, 1978||Jan 3, 1984||Board Of Trustees Of The Leland Stanford Junior University||Exponentiation cryptographic apparatus and method|
|US4827508||Oct 14, 1986||May 2, 1989||Personal Library Software, Inc.||Database usage metering and protection system and method|
|US4896275 *||Jul 10, 1987||Jan 23, 1990||Bull Hn Information Systems Inc.||Full page graphics image display data reduction|
|US4977594||Feb 16, 1989||Dec 11, 1990||Electronic Publishing Resources, Inc.||Database usage metering and protection system and method|
|US4979210||Jul 8, 1988||Dec 18, 1990||Matsushita Electric Industrial Co., Ltd.||Method and apparatus for protection of signal copy|
|US5050213||Aug 6, 1990||Sep 17, 1991||Electronic Publishing Resources, Inc.||Database usage metering and protection system and method|
|US5073925||Jun 13, 1990||Dec 17, 1991||Matsushita Electric Industrial Co., Ltd.||Method and apparatus for the protection of signal copy|
|US5369707 *||Jan 27, 1993||Nov 29, 1994||Tecsec Incorporated||Secure network method and apparatus|
|US5406627 *||Dec 28, 1992||Apr 11, 1995||Nec Home Electronics, Ltd.||Digital data cryptographic system|
|US5410598||Sep 27, 1994||Apr 25, 1995||Electronic Publishing Resources, Inc.||Database usage metering and protection system and method|
|US5469536 *||May 21, 1993||Nov 21, 1995||Imageware Software, Inc.||Image editing system including masking capability|
|US5497419 *||Apr 19, 1994||Mar 5, 1996||Prima Facie, Inc.||Method and apparatus for recording sensor data|
|US5513261||Dec 29, 1993||Apr 30, 1996||At&T Corp.||Key management scheme for use with electronic cards|
|US5530739||Mar 18, 1992||Jun 25, 1996||Fujitsu Limited||Mail center management system|
|US5530751 *||Jun 30, 1994||Jun 25, 1996||Hewlett-Packard Company||Embedded hidden identification codes in digital objects|
|US5530759 *||Feb 1, 1995||Jun 25, 1996||International Business Machines Corporation||Color correct digital watermarking of images|
|US5598470 *||Apr 25, 1994||Jan 28, 1997||International Business Machines Corporation||Method and apparatus for enabling trial period use of software products: Method and apparatus for utilizing a decryption block|
|US5613004||Jun 7, 1995||Mar 18, 1997||The Dice Company||Steganographic method and device|
|US5625690 *||Nov 15, 1993||Apr 29, 1997||Lucent Technologies Inc.||Software pay per use system|
|US5633932 *||Dec 19, 1995||May 27, 1997||Intel Corporation||Apparatus and method for preventing disclosure through user-authentication at a printing node|
|US5664018||Mar 12, 1996||Sep 2, 1997||Leighton; Frank Thomson||Watermarking process resilient to collusion attacks|
|US5687236 *||Dec 31, 1996||Nov 11, 1997||The Dice Company||Steganographic method and device|
|US5719937 *||Sep 12, 1996||Feb 17, 1998||Solana Technology Develpment Corporation||Multi-media copy management system|
|US5737416 *||Aug 2, 1996||Apr 7, 1998||International Business Machines Corporation||Method and apparatus for enabling trial period use of software products: method and apparatus for utilizing a decryption stub|
|US5745569||Jan 17, 1996||Apr 28, 1998||The Dice Company||Method for stega-cipher protection of computer code|
|US5765152 *||Oct 13, 1995||Jun 9, 1998||Trustees Of Dartmouth College||System and method for managing copyrighted electronic media|
|US5799083 *||Aug 26, 1996||Aug 25, 1998||Brothers; Harlan Jay||Event verification system|
|US5822432||Jan 17, 1996||Oct 13, 1998||The Dice Company||Method for human-assisted random key generation and application for digital watermark system|
|US5859920 *||Nov 30, 1995||Jan 12, 1999||Eastman Kodak Company||Method for embedding digital information in an image|
|US5870474 *||Dec 29, 1995||Feb 9, 1999||Scientific-Atlanta, Inc.||Method and apparatus for providing conditional access in connection-oriented, interactive networks with a multiplicity of service providers|
|US5889868||Jul 2, 1996||Mar 30, 1999||The Dice Company||Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data|
|US5894521 *||Aug 15, 1997||Apr 13, 1999||Direct Business Technologies, Inc.||System and method for encrypting sensitive information|
|US5905800||Mar 25, 1998||May 18, 1999||The Dice Company||Method and system for digital watermarking|
|US5912972 *||Mar 26, 1997||Jun 15, 1999||Sony Corporation||Method and apparatus for embedding authentication information within digital data|
|US5930369 *||Sep 10, 1997||Jul 27, 1999||Nec Research Institute, Inc.||Secure spread spectrum watermarking for multimedia data|
|US5930377 *||May 7, 1998||Jul 27, 1999||Digimarc Corporation||Method for image encoding|
|US5963909 *||Nov 25, 1997||Oct 5, 1999||Solana Technology Development Corporation||Multi-media copy management system|
|US5973731 *||May 30, 1995||Oct 26, 1999||Schwab; Barry H.||Secure identification system|
|US5974141||Oct 18, 1996||Oct 26, 1999||Mitsubishi Corporation||Data management system|
|US5999217 *||Mar 11, 1997||Dec 7, 1999||Berners-Lee; Charles Peter||Apparatus and method for encoding data|
|US6041316 *||Jul 25, 1994||Mar 21, 2000||Lucent Technologies Inc.||Method and system for ensuring royalty payments for data delivered over a network|
|US6081251 *||May 9, 1995||Jun 27, 2000||Sony Corporation||Apparatus and method for managing picture data|
|US6278780 *||Oct 29, 1998||Aug 21, 2001||Nec Corporation||Method of and an apparatus for generating internal crypto-keys|
|EP0649261A2||Oct 17, 1994||Apr 19, 1995||Canon Kabushiki Kaisha||Image data processing and encrypting apparatus|
|NL100523A||Title not available|
|WO1997044736A1||May 15, 1997||Nov 27, 1997||Apple Computer, Inc.||Method and apparatus for two-level copy protection|
|WO1999052271A1||Apr 2, 1999||Oct 14, 1999||Moskowitz Scott A||Multiple transform utilization and applications for secure digital watermarking|
|WO1999063443A1||Jun 1, 1998||Dec 9, 1999||Datamark Technologies Pte Ltd.||Methods for embedding image, audio and video watermarks in digital data|
|1||Bender, et al., "Techniques for data hiding" IBM Systems Journal, vol. 35, Nos. 3&4, 1996.|
|2||*||Horowitz, Paul and Winfield Hill, The Art of Electronics, 1989, p. 7.*|
|3||International Search Report in corresoponding PCT/US00/18411.|
|4||PCT Invitation to Pay Additional Fees in International Application No. PCT/US00/18411.|
|5||*||Schneier, Bruce, Applied Cryptography 1996, John Wiley & Sons, Inc. 2nd ed., p. 41.*|
|6||*||Schneier, Bruce, Applied Cryptography, 1996, pp. 270-273, 53, 33, 38.*|
|7||*||Schneier, Bruce, Applied Cryptography, 2nd ed., pp: 311-313.*|
|8||U.S. Patent Appl'n Ser. No. 08/587,943, "Method for Stega-Cipher Protection of Computer Code".|
|9||U.S. Patent Appl'n Ser. No. 08/587,944, "Human Assisted Random Key Generation . . .".|
|10||U.S. Patent Appl'n Ser. No. 08/677,435, "Optimization Methods for the Insertion, Protection and . . .".|
|11||U.S. Patent Appl'n Ser. No. 08/772,222, "Z-Transform Implementation of Digital Watermarks".|
|12||U.S. Patent Appl'n Ser. No. 08/775,216, "Steganographic Method and Device".|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US6915481||Jan 11, 2000||Jul 5, 2005||Cognicity, Inc.||Transactional watermarking|
|US7068787 *||Mar 24, 2000||Jun 27, 2006||Contentguard Holdings, Inc.||System and method for protection of digital works|
|US7072470 *||Nov 19, 2003||Jul 4, 2006||Kabushiki Kaisha Toshiba||Video scramble/descramble apparatus|
|US7080252 *||Jan 16, 2001||Jul 18, 2006||Hitachi, Ltd.||Method and apparatus for secure data transmission via network|
|US7127615||Sep 20, 2001||Oct 24, 2006||Blue Spike, Inc.||Security based on subliminal and supraliminal channels for data objects|
|US7159116||Dec 7, 2000||Jan 2, 2007||Blue Spike, Inc.||Systems, methods and devices for trusted transactions|
|US7177429||Dec 7, 2000||Feb 13, 2007||Blue Spike, Inc.||System and methods for permitting open access to data objects and for securing data within the data objects|
|US7299498 *||Oct 15, 2001||Nov 20, 2007||Loudeye Corp.||System and method of sharing digital literary works while protecting against illegal reproduction through communication network|
|US7366907 *||Oct 27, 2000||Apr 29, 2008||Sony Corporation||Information processing device and method and program storage medium|
|US7369677||Apr 24, 2006||May 6, 2008||Verance Corporation||System reactions to the detection of embedded watermarks in a digital host content|
|US7376243 *||Jan 27, 2006||May 20, 2008||Qualcomm Incorporated||Apparatus and method for watermarking a digital image|
|US7447907 *||Apr 4, 2001||Nov 4, 2008||Ecd Systems, Inc.||Method and system for data delivery and reproduction|
|US7552334 *||Sep 24, 2003||Jun 23, 2009||The Boeing Company||System and method for presentation integrity|
|US7616776||Apr 26, 2005||Nov 10, 2009||Verance Corproation||Methods and apparatus for enhancing the robustness of watermark extraction from digital host content|
|US7647502||Nov 15, 2006||Jan 12, 2010||Wistaria Trading, Inc.||Optimization methods for the insertion, protection, and detection of digital watermarks in digital data|
|US7647503||Sep 7, 2007||Jan 12, 2010||Wistaria Trading, Inc.||Optimization methods for the insertion, projection, and detection of digital watermarks in digital data|
|US7660700||Feb 9, 2010||Blue Spike, Inc.||Method and device for monitoring and analyzing signals|
|US7664263||Jun 25, 2003||Feb 16, 2010||Moskowitz Scott A||Method for combining transfer functions with predetermined key creation|
|US7664264||Sep 12, 2006||Feb 16, 2010||Blue Spike, Inc.||Utilizing data reduction in steganographic and cryptographic systems|
|US7664958||Aug 31, 2007||Feb 16, 2010||Wistaria Trading, Inc.||Optimization methods for the insertion, protection and detection of digital watermarks in digital data|
|US7730317||Nov 2, 2006||Jun 1, 2010||Wistaria Trading, Inc.||Linear predictive coding implementation of digital watermarks|
|US7738659||Feb 21, 2006||Jun 15, 2010||Moskowitz Scott A||Multiple transform utilization and application for secure digital watermarking|
|US7761712||Jul 20, 2010||Wistaria Trading, Inc.||Steganographic method and device|
|US7770017||Aug 3, 2010||Wistaria Trading, Inc.||Method and system for digital watermarking|
|US7779261||Jan 3, 2007||Aug 17, 2010||Wistaria Trading, Inc.||Method and system for digital watermarking|
|US7788684||Oct 8, 2003||Aug 31, 2010||Verance Corporation||Media monitoring, management and information system|
|US7813506||Mar 30, 2009||Oct 12, 2010||Blue Spike, Inc||System and methods for permitting open access to data objects and for securing data within the data objects|
|US7822197||Sep 7, 2007||Oct 26, 2010||Wistaria Trading, Inc.||Optimization methods for the insertion, protection, and detection of digital watermarks in digital data|
|US7830915||Nov 9, 2010||Wistaria Trading, Inc.||Methods and systems for managing and exchanging digital information packages with bandwidth securitization instruments|
|US7844074||Jun 30, 2008||Nov 30, 2010||Wistaria Trading, Inc.||Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data|
|US7870393||Aug 21, 2007||Jan 11, 2011||Wistaria Trading, Inc.||Steganographic method and device|
|US7877609||Nov 12, 2009||Jan 25, 2011||Wistaria Trading, Inc.||Optimization methods for the insertion, protection, and detection of digital watermarks in digital data|
|US7930545||Nov 15, 2006||Apr 19, 2011||Wistaria Trading, Inc.|
|US7949494||May 24, 2011||Blue Spike, Inc.||Method and device for monitoring and analyzing signals|
|US7953981||May 31, 2011||Wistaria Trading, Inc.|
|US7970166||Jun 28, 2011||Digimarc Corporation||Steganographic encoding methods and apparatus|
|US7984511 *||Oct 31, 2007||Jul 19, 2011||Rovi Solutions Corporation||Self-protecting digital content|
|US7987371||Jul 9, 2008||Jul 26, 2011||Wistaria Trading, Inc.|
|US7987510 *||Jul 7, 2003||Jul 26, 2011||Rovi Solutions Corporation||Self-protecting digital content|
|US7991188||Aug 31, 2007||Aug 2, 2011||Wisteria Trading, Inc.|
|US7996913||Oct 31, 2007||Aug 9, 2011||Rovi Solutions Corporation||Self-protecting digital content|
|US8001616||May 15, 2009||Aug 16, 2011||The Boeing Company||System and method for presentation integrity|
|US8005258||Aug 23, 2011||Verance Corporation||Methods and apparatus for enhancing the robustness of watermark extraction from digital host content|
|US8046841||Aug 21, 2007||Oct 25, 2011||Wistaria Trading, Inc.||Steganographic method and device|
|US8103049||Jan 24, 2012||Verance Corporation||System reactions to the detection of embedded watermarks in a digital host content|
|US8104079||Jan 24, 2012||Moskowitz Scott A||Methods, systems and devices for packet watermarking and efficient provisioning of bandwidth|
|US8121343||Oct 10, 2010||Feb 21, 2012||Wistaria Trading, Inc||Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data|
|US8160249||Apr 17, 2012||Blue Spike, Inc.||Utilizing data reduction in steganographic and cryptographic system|
|US8161286||Jun 21, 2010||Apr 17, 2012||Wistaria Trading, Inc.||Method and system for digital watermarking|
|US8171561||Oct 9, 2008||May 1, 2012||Blue Spike, Inc.||Secure personal content server|
|US8175330||Aug 18, 2011||May 8, 2012||Wistaria Trading, Inc.|
|US8214175||Feb 26, 2011||Jul 3, 2012||Blue Spike, Inc.||Method and device for monitoring and analyzing signals|
|US8224705||Jul 17, 2012||Moskowitz Scott A||Methods, systems and devices for packet watermarking and efficient provisioning of bandwidth|
|US8225099||Jul 17, 2012||Wistaria Trading, Inc.||Linear predictive coding implementation of digital watermarks|
|US8238553||Mar 30, 2009||Aug 7, 2012||Wistaria Trading, Inc||Steganographic method and device|
|US8259938||Jun 19, 2009||Sep 4, 2012||Verance Corporation||Efficient and secure forensic marking in compressed|
|US8265276||Dec 22, 2009||Sep 11, 2012||Moskowitz Scott A||Method for combining transfer functions and predetermined key creation|
|US8265278||Sep 21, 2010||Sep 11, 2012||Blue Spike, Inc.||System and methods for permitting open access to data objects and for securing data within the data objects|
|US8271795||Sep 11, 2006||Sep 18, 2012||Blue Spike, Inc.||Security based on subliminal and supraliminal channels for data objects|
|US8280103||Nov 19, 2010||Oct 2, 2012||Verance Corporation||System reactions to the detection of embedded watermarks in a digital host content|
|US8281140||Oct 2, 2012||Wistaria Trading, Inc|
|US8307213||Nov 6, 2012||Wistaria Trading, Inc.||Method and system for digital watermarking|
|US8340348||Dec 25, 2012||Verance Corporation||Methods and apparatus for thwarting watermark detection circumvention|
|US8346567||Jan 1, 2013||Verance Corporation||Efficient and secure forensic marking in compressed domain|
|US8451086||Jan 30, 2012||May 28, 2013||Verance Corporation||Remote control signaling using audio watermarks|
|US8467525||Jun 18, 2013||Wistaria Trading, Inc.||Steganographic method and device|
|US8473746||Oct 14, 2011||Jun 25, 2013||Scott A. Moskowitz||Methods, systems and devices for packet watermarking and efficient provisioning of bandwidth|
|US8526611||Mar 19, 2012||Sep 3, 2013||Blue Spike, Inc.||Utilizing data reduction in steganographic and cryptographic systems|
|US8533481||Nov 3, 2011||Sep 10, 2013||Verance Corporation||Extraction of embedded watermarks from a host content based on extrapolation techniques|
|US8538011||Aug 29, 2006||Sep 17, 2013||Blue Spike, Inc.||Systems, methods and devices for trusted transactions|
|US8538066||Sep 4, 2012||Sep 17, 2013||Verance Corporation||Asymmetric watermark embedding/extraction|
|US8542831||May 4, 2010||Sep 24, 2013||Scott A. Moskowitz||Multiple transform utilization and application for secure digital watermarking|
|US8549305||Oct 27, 2010||Oct 1, 2013||Wistaria Trading, Inc.||Steganographic method and device|
|US8549307||Aug 29, 2011||Oct 1, 2013||Verance Corporation||Forensic marking using a common customization function|
|US8571993||Jun 17, 2011||Oct 29, 2013||Irdeto Usa, Inc.||Reprogrammable security for controlling piracy and enabling interactive content|
|US8612765||Mar 25, 2012||Dec 17, 2013||Blue Spike, Llc||Security based on subliminal and supraliminal channels for data objects|
|US8615104||Nov 3, 2011||Dec 24, 2013||Verance Corporation||Watermark extraction based on tentative watermarks|
|US8681978||Dec 17, 2012||Mar 25, 2014||Verance Corporation||Efficient and secure forensic marking in compressed domain|
|US8682026||Nov 3, 2011||Mar 25, 2014||Verance Corporation||Efficient extraction of embedded watermarks in the presence of host content distortions|
|US8706570||Jul 17, 2012||Apr 22, 2014||Scott A. Moskowitz||Methods, systems and devices for packet watermarking and efficient provisioning of bandwidth|
|US8712728||Mar 13, 2013||Apr 29, 2014||Blue Spike Llc||Method and device for monitoring and analyzing signals|
|US8726027||Sep 26, 2008||May 13, 2014||Sca Ipla Holdings Inc.||Method and system for data delivery and reproduction|
|US8726304||Sep 13, 2012||May 13, 2014||Verance Corporation||Time varying evaluation of multimedia content|
|US8739295||Mar 7, 2012||May 27, 2014||Blue Spike, Inc.||Secure personal content server|
|US8745403||Nov 23, 2011||Jun 3, 2014||Verance Corporation||Enhanced content management based on watermark extraction records|
|US8745404||Nov 20, 2012||Jun 3, 2014||Verance Corporation||Pre-processed information embedding system|
|US8767962||Aug 11, 2012||Jul 1, 2014||Blue Spike, Inc.|
|US8774216||Sep 28, 2010||Jul 8, 2014||Wistaria Trading, Inc.||Exchange mechanisms for digital information packages with bandwidth securitization, multichannel digital watermarks, and key management|
|US8781121||Mar 13, 2013||Jul 15, 2014||Blue Spike, Inc.||Utilizing data reduction in steganographic and cryptographic systems|
|US8781967||Jul 7, 2006||Jul 15, 2014||Verance Corporation||Watermarking in an encrypted domain|
|US8789201||Mar 12, 2013||Jul 22, 2014||Blue Spike, Inc.||Secure personal content server|
|US8791789||May 24, 2013||Jul 29, 2014||Verance Corporation||Remote control signaling using audio watermarks|
|US8798268||Mar 11, 2013||Aug 5, 2014||Blue Spike, Inc.|
|US8806517||May 10, 2010||Aug 12, 2014||Verance Corporation||Media monitoring, management and information system|
|US8811655||Sep 4, 2012||Aug 19, 2014||Verance Corporation||Circumvention of watermark analysis in a host content|
|US8838977||Apr 5, 2011||Sep 16, 2014||Verance Corporation||Watermark extraction and content screening in a networked environment|
|US8838978||Apr 5, 2011||Sep 16, 2014||Verance Corporation||Content access management using extracted watermark information|
|US8869222||Sep 13, 2012||Oct 21, 2014||Verance Corporation||Second screen content|
|US8923548||Nov 3, 2011||Dec 30, 2014||Verance Corporation||Extraction of embedded watermarks from a host content using a plurality of tentative watermarks|
|US8930719||Jul 24, 2012||Jan 6, 2015||Scott A. Moskowitz||Data protection method and device|
|US8949624||Jul 1, 2011||Feb 3, 2015||Irdeto Usa, Inc.||Method and system for secure access to non-volatile memory|
|US9009482||Sep 26, 2013||Apr 14, 2015||Verance Corporation||Forensic marking using a common customization function|
|US9021602||Mar 11, 2013||Apr 28, 2015||Scott A. Moskowitz||Data protection method and device|
|US9055239||Jul 19, 2007||Jun 9, 2015||Verance Corporation||Signal continuity assessment using embedded watermarks|
|US9070151||Mar 12, 2013||Jun 30, 2015||Blue Spike, Inc.||Systems, methods and devices for trusted transactions|
|US9104842||Aug 24, 2007||Aug 11, 2015||Scott A. Moskowitz||Data protection method and device|
|US9106964||Feb 8, 2013||Aug 11, 2015||Verance Corporation||Enhanced content distribution using advertisements|
|US9117270||Jun 2, 2014||Aug 25, 2015||Verance Corporation||Pre-processed information embedding system|
|US9153006||Aug 15, 2014||Oct 6, 2015||Verance Corporation||Circumvention of watermark analysis in a host content|
|US9160988||Mar 9, 2009||Oct 13, 2015||The Nielsen Company (Us), Llc||System and method for payload encoding and decoding|
|US9171136||Nov 17, 2014||Oct 27, 2015||Wistaria Trading Ltd||Data protection method and device|
|US9189955||Jul 28, 2014||Nov 17, 2015||Verance Corporation||Remote control signaling using audio watermarks|
|US9191205||Apr 22, 2014||Nov 17, 2015||Wistaria Trading Ltd||Multiple transform utilization and application for secure digital watermarking|
|US9191206||Apr 22, 2014||Nov 17, 2015||Wistaria Trading Ltd||Multiple transform utilization and application for secure digital watermarking|
|US9208334||Oct 25, 2013||Dec 8, 2015||Verance Corporation||Content management using multiple abstraction layers|
|US9251549||Jul 23, 2013||Feb 2, 2016||Verance Corporation||Watermark extractor enhancements based on payload ranking|
|US9258116||May 7, 2014||Feb 9, 2016||Wistaria Trading Ltd|
|US9262794||Mar 14, 2014||Feb 16, 2016||Verance Corporation||Transactional video marking system|
|US9270859||May 6, 2014||Feb 23, 2016||Wistaria Trading Ltd||Utilizing data reduction in steganographic and cryptographic systems|
|US9323902||Dec 13, 2011||Apr 26, 2016||Verance Corporation||Conditional access using embedded watermarks|
|US20010018740 *||Jan 16, 2001||Aug 30, 2001||Katsumi Marukawa||Method and apparatus for secure data transmission via network|
|US20010037465 *||Apr 4, 2001||Nov 1, 2001||Hart John J.||Method and system for data delivery and reproduction|
|US20010042048 *||May 15, 2001||Nov 15, 2001||The Regents Of The University Of California||Method and apparatus for electronically distributing audio recordings|
|US20020066018 *||Oct 17, 2001||May 30, 2002||Linnartz Johan Paul Marie Gerard||Multiple autentication sessions for content protection|
|US20020071556 *||Dec 7, 2000||Jun 13, 2002||Moskowitz Scott A.|
|US20020168067 *||May 8, 2001||Nov 14, 2002||Timofei Kouzminov||Copy protection method and system for a field-programmable gate array|
|US20020172116 *||Sep 13, 2001||Nov 21, 2002||Aprea Javier Francisco||Distribution of content|
|US20030016829 *||Jun 13, 2002||Jan 23, 2003||Samsung Electronics Co. Ltd.||System and method for protecting content data|
|US20030078888 *||Oct 15, 2001||Apr 24, 2003||Cheol-Woong Lee||System and method of sharing digital literary works while protecting against illegal reproduction through communication network|
|US20030221105 *||May 20, 2002||Nov 27, 2003||Autodesk, Inc.||Extensible mechanism for attaching digital signatures to different file types|
|US20040101137 *||Nov 19, 2003||May 27, 2004||Shinichiro Koto||Video scramble/descramble apparatus|
|US20040133794 *||Jul 7, 2003||Jul 8, 2004||Kocher Paul C.||Self-protecting digital content|
|US20050066173 *||Sep 24, 2003||Mar 24, 2005||The Boeing Company||System and method for presentation integrity|
|US20060095761 *||Oct 21, 2005||May 4, 2006||Tvidia Corporation||Selective video encryption method and apparatus|
|US20060120562 *||Jan 27, 2006||Jun 8, 2006||Brian Fudge||Apparatus and method for watermarking a digital image|
|US20060239501 *||Apr 26, 2005||Oct 26, 2006||Verance Corporation||Security enhancements of digital watermarks for multi-media content|
|US20060239502 *||Apr 26, 2005||Oct 26, 2006||Verance Corporation||Methods and apparatus for enhancing the robustness of watermark extraction from digital host content|
|US20070079131 *||Nov 2, 2006||Apr 5, 2007||Wistaria Trading, Inc.||Linear predictive coding implementation of digital watermarks|
|US20080022114 *||Sep 7, 2007||Jan 24, 2008||Wistaria Trading, Inc.|
|US20080101604 *||Oct 31, 2007||May 1, 2008||Cryptography Research, Inc.||Self-protecting digital content|
|US20080133938 *||Oct 31, 2007||Jun 5, 2008||Cryptography Research, Inc.||Self-protecting digital content|
|US20090049303 *||Sep 26, 2008||Feb 19, 2009||Ecd Sysems, Inc.||Method and system for data delivery and reproduction|
|US20090228710 *||May 15, 2009||Sep 10, 2009||The Boeing Company||System and method for presentation integrity|
|US20120005588 *||Jan 5, 2012||International Business Machines Corporation||Displaying Concurrently Presented Versions in Web Conferences|
|USRE44222||May 14, 2013||Scott Moskowitz||Methods, systems and devices for packet watermarking and efficient provisioning of bandwidth|
|USRE44307||Jun 4, 2012||Jun 18, 2013||Scott Moskowitz||Methods, systems and devices for packet watermarking and efficient provisioning of bandwidth|
|WO2010076582A2 *||Mar 12, 2008||Jul 8, 2010||Lionel Poizner||Theft protection method and promotion system for audio media|
|WO2010076582A3 *||Mar 12, 2008||Sep 10, 2010||Lionel Poizner||Theft protection method and promotion system for audio media|
|U.S. Classification||713/176, 708/254, 380/46|
|International Classification||G06T1/00, G06F1/00, G06F21/00|
|Cooperative Classification||G06F21/16, G06T1/005, G06F2211/007|
|European Classification||G06F21/16, G06T1/00W6|
|Jun 1, 1999||AS||Assignment|
Owner name: WISTARIA TRADING, INC., FLORIDA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DICE COMPANY;REEL/FRAME:009988/0623
Effective date: 19990512
|Jan 14, 2007||FPAY||Fee payment|
Year of fee payment: 4
|Aug 5, 2010||FPAY||Fee payment|
Year of fee payment: 8
|Oct 5, 2014||FPAY||Fee payment|
Year of fee payment: 12
|Aug 17, 2015||AS||Assignment|
Owner name: WISTARIA TRADING LTD, BERMUDA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MOSKOWITZ, SCOTT A.;REEL/FRAME:036342/0953
Effective date: 20150814
|Aug 18, 2015||AS||Assignment|
Owner name: WISTARIA TRADING LTD, BERMUDA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WISTARIA TRADING, INC.;REEL/FRAME:036387/0177
Effective date: 20150814